12月英语四级备考语法精讲：比较状语从句

英语自学网

　　比较状语从句：
　　than, as…as…，not so as…，(not) the same as, the+比较级;
　　eg：Light travels fast than sound.
　　the+比较级：
　　eg：The sooner，the better.
　　eg：Girls are thus seen as less valuable than boys and art kept at home to do housework while their brothers are sent to school - the prophecy(预言) becomes self- fulfilling, trapping women in a vicious circle (恶性循环) of neglect.
　　(1)当……的时候：while, when, as ;
　　when：强调一件事情正在发生的时候，另外一件事情突然发生;
　　eg：When I was watching TV, my mother came back.
　　while：强调两个动作同时进行，一边……一边……;
　　eg：My father is cooking while my mother is reading newspaper.
　　as："随时间推移"
　　eg：As time went by, the days became longer and longer.
　　(2)一……就……：as soon as ,主将从现;用directly，immediately, instantly连接两个句子;一些名词如the minute，the moment, the instant也可表示;no sooner… than, hardly… when后面的句子需要倒装;
　　eg：I will write to you the moment/minute I arrived in Paris.
　　(3)特殊单词：by the time that, every/each time(使用时后面不要再加when)
　　(4)till&until：
　　① 肯定形式表示的意思是"做某事直至某时"，动词必须是延续性的;
　　否定形式表达的意思是"直至某时才做某事"，一般用until，动词为延续性或非延续性都可以;
　　eg: I slept until midnight.
　　Wait till I call you.
　　She didn't arrive until 6 o'clock.
　　② Until可用于句首，而till通常不用于句首，通常用于句中;
　　eg: Until you told me, I had heard nothing of what happened.
        　　eg：As you sleep you pass through a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that repeats approximately every 90 minutes.